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Regex Examples

JavaFAQ Home » Text processing Go to all tips in Text processing

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Finding the domain name in HTML links.
<a +href="http://([w.-]+)OK. The domain name in an HTML link. Ie, an "<", one or more blanks, href=, then one or more word characters or dots. Group 1 matches the domain name. This only matches lowercase; to match regardless of case, the Pattern object should be created with the second parameter specifying case insensitivity.
<a +href="http://(.+)["/?:]BAD. This pattern would appear to work, stopping when a character after the domain name is found. However, "+" is a greedy qualifier, it will match all charcters to the end of the string, then backup until it finds one of the terminating characters, ""/?:", which almost surely won't be in the same link.
<a +href="http://(.+?)["/?:]OK. Fixes the above pattern by using the lazy quantifier +? .

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